Morphological testing method and device for mercury in full-flow flue gas of stationary pollution source

A technology for fixing pollution sources and testing methods, applied in the field of environmental monitoring, can solve the problems of cumbersome treatment process, complex components, low upper limit of anti-interference concentration, etc., and achieve the effects of flexible collection methods, reduced corrosion loss, and reasonable follow-up treatment arrangements.

Active Publication Date: 2022-05-13
TSINGHUA UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] Although the OH method and EPA method 29 have reduced SO in flue gas 2 The interference effect is taken into account, but its effect on SO 2 The upper limit of the anti-interference concentration is lower, only 0.25% and 0.5% respectively; for complex components, especially those containing high concentrations of SO 2 (>10%) industrial flue gas (such as smelting flue gas before acid production in the non-ferrous metal industry), still cannot meet the monitoring needs of mercury in flue gas from fixed pollution sources
[0007] In addition, for some industrial flue gas with low sulfur content, the OH method and EPA method 29 did not distinguish the differences in flue gas components, and also used 10% hydrogen peroxide as SO 2 Absorbing liquid, increasing the workload of neutralizing the titration of the absorbing liquid in the later stage, the processing technology is relatively cumbersome, which is not conducive to the realization of energy saving and emission reduction goals of production enterprises

Method used

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  • Morphological testing method and device for mercury in full-flow flue gas of stationary pollution source
  • Morphological testing method and device for mercury in full-flow flue gas of stationary pollution source
  • Morphological testing method and device for mercury in full-flow flue gas of stationary pollution source

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Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a fractal form testing device for the whole process flue gas mercury of a fixed pollution source, such as figure 1 shown, including:

[0039] Thermostatic sampling gun 10 (101 thermocouple, 102 sampling nozzle, 103 pitot tube, 104 pressure gauge and 105 high-sprayed silicon glass or quartz sampling liner);

[0040] Constant temperature filtration unit (constant temperature filter box) 20 (201 heating box, 202 membrane tray, 203 quartz filter membrane, the diameter of the filter membrane is 83mm, and the blocking efficiency of particles with a particle size greater than 0.3μm is not less than 99.95%);

[0041] Impact absorption bottle box 30;

[0042] Metering unit 40 (401 thermocouple, check valve 402 and dry gas meter 403);

[0043] Power and regulation equipment unit 50 (vacuum gauge 501, main valve 502 and vacuum pump 503).

Embodiment 2

[0045] This embodiment provides a morphological testing method for mercury in the flue gas of a fixed pollution source, including: sampling, filtering, collecting, measuring, and regulating the flue gas using the testing device described in Example 1;

[0046] Among them, the collection adopts the impact absorption bottle box; different combinations of absorption bottles are used based on different pollution control nodes; among them:

[0047] (1) Conventional process flue gas refers to process flue gas in fixed pollution sources such as coal burning, cement, incineration, etc. The process refers to the process before and after denitrification, desulfurization, and dust removal of flue gas; SO 2 compositional characteristics.

[0048] (2) The smelting flue gas before the colored acid production has a high concentration of SO 2 compositional characteristics.

[0049] (3) After desulfurization, the tail gas has a lower concentration of SO 2 compositional characteristics.

...

experiment example 1

[0054] Taking the whole process flue gas at the kiln tail of a certain cement factory as an example, the mercury concentration in the flue gas was tested by using the test method of the present invention and the OH method.

[0055] The flue gas at the kiln tail has complex components. Based on this, the combination of absorption liquids corresponding to the conventional process flue gas in Table 1 was selected for testing, namely: 3 bottles of 100ml 1.5mol / L KOH absorption liquid + 1 bottle of 100ml 10%H 2 o 2 -HNO 3 Absorption solution + 3 bottles of 100ml 4% KMnO 4 -10%H 2 SO 4 +1 bottle of silicone.

[0056] The conventional absorption solution for the OH method: 3 bottles of 100ml 1mol / L KCl absorption solution + 1 bottle of 100ml 10%H 2 o 2 -5%HNO 3 Absorption solution + 3 bottles of 100ml 4% KMnO 4 -10%H 2 SO 4 +1 bottle of silicone.

[0057] The result is as figure 2 Shown:

[0058] 6 groups of results of OH method test from 65.4μg / m 3 to 1374.4μg / m 3 sc...

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Abstract

The invention relates to the technical field of environmental monitoring, in particular to a morphological testing method and a morphological testing device for mercury in full-flow high-SO2 flue gas of a stationary pollution source. The invention provides a method for testing mercury in full-flow flue gas of a stationary pollution source. The method comprises the following steps: collecting mercury in the flue gas through an impact type absorption bottle box; and different absorption bottle combinations are adopted based on different pollution control nodes. By analyzing flue gas components and pollution control nodes in different industries, adjusting the type and concentration of the absorption liquid and screening a proper absorption bottle combination mode on the basis of the existing OH method, the adsorption influence of SO2 on elemental mercury is reduced to the greatest extent, the monitoring accuracy is improved, meanwhile, the post-treatment process of the absorption liquid is simplified, and the production cost is reduced. The treatment cost is reduced. Compared with the existing OH method, the testing method disclosed by the invention not only has good consistency and stability, but also is more flexible in monitoring means and more reasonable in cost, and meets the flue gas mercury monitoring requirements of various complex flue gas systems.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a high-SO 2 Specific test method and test device for flue gas mercury. Background technique [0002] It is well known that mercury is extremely harmful to the environment and human health. Coal-fired power plants, industrial coal combustion, non-ferrous metal smelting industry, waste incineration, cement industry and other industries are the main sources of flue gas mercury emissions, so it is necessary to strictly monitor mercury in industrial flue gas. [0003] The traditional detection method for mercury in flue gas is "HJ 543-2009 Determination of Mercury in Exhaust Gas from Stationary Pollution Sources by Cold Atomic Absorption Spectrophotometry". SO in 2 It can compete with mercury to be dissolved in the absorption liquid, which reduces the capture efficiency of the absorption liquid for mercury in the flue gas and affects the accuracy of flue gas mercur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/34G01D21/02
CPCG01N33/0009G01N33/0045G01N1/34G01D21/02
Inventor 吴清茹李国良王书肖李智坚
Owner TSINGHUA UNIV
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